Thanks for the thoughts, before the repair it was solid too. I will try redesigning it.
Maybe try an easier shape/model just to get a feeling what is important.
I will give designing it a try in 360 or tinkercad but I will have to learn them first 😉
For the beginning use tinkercad, it is much easier to learn.
Otherwise Fusion is so powerful, so you should definitely learn it.
I ended up trying it in both TinkerCad and Fusion360 and gave up too steep a learning curve and too different to FreeCAD. So I re-drew it in FreeCAD doing it differently and it sliced fine and is now printing. 😀
Thanks for all the help and suggestions.
Glad it worked!
When you know FreeCad it makes no sense to learn another software when you are happy with it.
The STL is a solid block, so why should it slice as hollow?
Have you designed it as hollow? Can you post a screenshot of the model in Freecad which shows that it is hollow?
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